Deep-boring apparatus.



NO- 801,072- PATENTED 00T. a, 1905., E. PRIBH. DEEP BORING APPARATUS.

APPLIOATON FILED MAYs,19o5A UNITED STATES PATENT EETCE,

EDUARD FRIEH, OF NORDHAUSEN, GERMANY, ASSIGNOR TO DEUTSCHE TIEFBOHR AKTIEN-GESELLSCHAFT, OF NORDHAUSEN, PRUSSIA, GER- MANY, A CORPORATION.

Specication of Letters Patent.

Patented Oct. 3, 1905.

Application led May 3, 1905. Serial No. 258,713.

T0 all whom, it may concern:

Beit known thatI, EDUARD FRIEH, asubject of the German Emperor, residing at Nordhausen, Prussia,German Empire,(whose postoiiice address is No. 18 Erfurterstrasse, Nordhausen,) have invented new and useful Improvements in Deep-Boring Apparatus, of which the following is a speciiication.

This invention relates to improvements in deep-boring' apparatus.

Percussion core-drills with core-protecting tubes in which the core-protecting tube does not participate in the percussion movement are well known. The proper object of such protective tubes to protect the core against breaking and grinding' is, however, only impert'ectly attained in well-known apparatus, for each jamming of the core-protecting tube in the outer tube, which cannot be avoided when rinsing-water is dirty or the rock bored is very loose, results in the loosely-suspended core-protecting tube being raised, together with the boringtool-that is to say, it is no longer preventedfrom participating in the percussion movement. Moreover, these drills have the drawback that they must be driven from the surface of the ground, so that their edectiveness depends on a large stroke and heavy'mass, which easily leads to the breaking ot' their component parts, which are necessarily lightly built.

A The above-mentioned drawbacks are obviated according to this invention by the coreprotecting tube being rigidly secured to the boring-rod, the core-boring tool being in known manner driven by a motor mounted on the rod immediately above the borer. Only by arranging the drive under ground it becomes possible to secure the core-tube rigidly to the boring-rod in the same way as in diamond drills, so that it cannot possibly participate in the percussion movement, and in this way it is possible to obtain cores of the same nature as with diamond drills. Owing to the use of this kind of drive, which has the advantage of enabling small moving' masses, short stroke, and a great number of shocks to be used, reliable working is insured and it becomes possible to obtain perfect cores and' to bring them up in good condition.

In the accompanying drawings, Figure 1 shows the whole apparatus partly in section. Fig. 2 shows a longitudinal section of the operating parts. Fig. 3 is a cross-section on the line A B of Eig. 2; Eig. 4, an elevation of the bore-crown with the core-tube.

The motor driving the boring crown or drill c, is constructed as a well-known solenoid boring-machine. The piston-rod c of the motor is secured to a cross-head (Z. In order that the outer tube g, secured to the motor and forming an abutment for its return-spring f, may extend down to the core-tube h, the cross-head Z is provided with three slots t', having the shape of circular segments, through which slots the tube g is passed. At the bottom end this piece of tube is connected, by means of an intermediate part c, to the coretube proper, t, which carries the core-tube shoe 7; with core-catching device Z of any desired shape. The slots of the shoe f: admit the chisel-cutters of the bore-crown a projecting inward, the said bore-crown being centrally guided on the shoe. In this way the diameter of the core obtained will be equal to the inside diameter of the core-tube. The shoe insures at the same time proper distance between the bore-crown c and the bottom ot' the bore-hole. The connection between the bore-crown c and the cross-head CZ is effected by means of the tube m. The path of the rinsing-water is shown by the arrows. The sleeve n prevents the rinsing-water from escaping at that point.

Fig. 3 is an elevation of a three-cutter borecrown with the core-tube shoe.

The working of the apparatus will now be readily understood. The borecrown c, the tube m, and the cross-head Z reciprocate in the bore-hole; but the core-tube shoe 7c, coretube It, and the piece ofA tube g do not participate in that movement. The core-tube is let down as the boring progresses and turned in accordance with the movement required. The consequence of this is to prevent the jamming of the core which takes place in the case of chisel-crowns without core-tubes and result in the necessity of immediately raising the core.

By using the drill according to this invention it is possible to make measurements to determine the dip and strike ot' the rock layers, which hitherto could be done only with diamond drills.

It is obvious that the application of this core-drill is not limited to the solenoid boring-machine. It can also be used with any other motor driven by water, air, or the like directly over the working' place.

IVhat I claim, and desire to secure by Letters Patent or' the United States, is-

l. In deep-boring apparatus with percussion-drill and core-tube the combination of the boring-rod with the core-tu be rigidly secured thereto, drill-driving apparatus within the bore-hole immediately above the working spot and percussion-drill connected with the driving apparatus, essentially as and for the purpose described.

2, In deep-boring apparatus with percussion-drill and core-tube, the combination of the boring-rod, the core-tube rigidly secured thereto and provided with slots in its lower extremity or shoe, drill-drivingl apparatus within the bore-hole, and a percussion-drill connected with the driving apparatus and EDUARD FRIEH.

Witnesses:

HENRY HAsrER, TOLD EMAR H AUP'r. 

